i had 4 of thoso 1650 drives cuz everybody were talking about them very positive. but i had a lot of problems with them. two of them allready doesnt work at all and the other two failing to burn a lot of dvds. i got aopen 400 watt psu. and i use d 930 pcocesser, 4*1650 drives, do you think my psu is not enough. bye the way how many dvd do u think i can burn with them. if thats the limit, i’ve allready burned about 500 dvds with each.